Crest Audio NC-DSP-A - TECHNICAL Instruction manual

NC-DSP-A Digital Signal Processor (DSP) with Analog Inputs
Architects and Engineers Specifications - NC-DSP-A.
The module shall plug into Crest Audio CKS or CKV Power Processing amplifiers in the
Input Processing bay. The module shall provide full DSP (digital signal processing) func-
tions. Capabilities for EQ, cross-over filters, delay, dynamics control, etc. are achievable
with Nexsys software modules The module shall be capable of being programmed and
updated over the NexSys network (if fitted in a CKS or CKV amplifier loaded with an NC-
NXS module and NexSys-compatible Power/Output module). The module shall operate as a
stand-alone unit after being programmed with the N-Coder/PC software. The audio inputs
shall consist of two balanced analog inputs on a barrier strip connector. Two, post-process-
ing, analog outputs on barrier strip connectors shall be provided to loop-thru out to addition-
al amp channels requiring the same processing. Two removable-knob gain pots shall be pro-
vided that control the level of each amplifier channel independent of programming. Input
sensitivity shall be selectable for either 10dBU or 20dBU. The module shall be designated
the Crest Audio model NC-DSP-A.
Product Information
The NC-DSP-A Module fits in the Input Processing bay located on the
rear panel of Crest Audio CKS, CKV & CKX Series Power Processing
amplifiers. It provides state-of-the-art digital signal processing integrat-
ed with the amplifier channel. It is identical in operation to the NC-DSP-
D but adds ADC converters, allowing analog audio to be digitally
processed. Two post-processing analog outputs are provided to daisy
chain out to additional amp channels requiring the same processing.
Input sensitivity is selectable for 10 dBU or 20 dBU. Individual channel
attenuators are provided with removable knobs for extra security.
Via NexSys®or N-Coder/PC software, algorithms are down-loaded to
the NC-DSP-A to perform crossover, equalizing, driver alignment, sys-
tem delay, limiting, compression, gating functions, etc. All the require-
ments for loudspeaker processing can be performed by the NC-DSP-A.
INPUT PROCESSING MODULE
FOR CKS, CKV & CKX SERIES
POWER PROCESSING AMPLIFIERS
Features:
• Digital signal processing and attenuation programmed by NexSys or N-Coder/PC software.
• Post-processing loop-thru outputs on barrier strip connectors • Crossover, EQ, delay, and dynamics functions
• Two delays are equivalent to 600 feet (183 meters) each • Amp channel gain pot knobs removable for security
• Simple setup, tamper-proof configuration • Balanced input barrier strip connectors
• Can be used stand-alone after being programmed • Selectable input sensitivity of 10 dBU or 20 dBU
Output
A
B
+
+
–
–Signal
Ground
Lift
Jumper
CLASS 2
WIRING MAY
BE USED
8
1
9
2
A
3
B
4
C
5
D
6
E
7
F
8
1
9
2
A
3
B
4
C
5
D
6
E
7
F
Model
Name
CKS 100
CKS 200
CKS 400
CKS 800
CKS 800-2
CKS 1200-2
CKS 1600-2
Output Power
@8Ω/Ch.
50W
100W
200W
400W
400W
600W
800W
Model
NC-NXS
Hi
Data
Lo
Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
Designed & manufactured in the USA by:
Network
+– +–
Address
Model
Name
CKV 100
CKV 200
CKV 400
CKV 800
CKV 1600
CKV 2400
Output Power
@70.7V
50W
100W
200W
400W
800W
1200W
Model
NC-DSP-A
78
9
5
2
0
1
346
10
78
9
5
2
0
1
346
10
++–
–
Input A Input B
Daisy Chain
ABLevel
B
Level
A
N-Coder
Data
Port
Input
Signal A
To other amplifiers
OR
PC Lap-Top running
N-Coder/PC software
N-Coder
Crest Audio
Revision 1.03E
Input
Signal B
NexSys Bus
NC-DSP-A connections
Power
Processing
Modules

Digital Signal Processor (DSP) with Analog Inputs
CH A
Power
Amp
CH B
Power
Amp
I/F
ckt
NexSys
Module Bus
DAC
DSP
Delay
MEM
Vosc
For LM
CH A OUT
CH B OUT
N-Coder
Data Port
DAC
CH B
+
-
G
CH A
+
-
G
Atten
Atten
ID
Daisy Chain
BLOCK
DIAGRAM
Crest Audio Inc.
100 Eisenhower Dr., Paramus NJ 07652 USA
TEL: [phone] FAX: [phone]
http://www.crestaudio.com
Printed in USA
NC-DSP-A Input Processing Module
SPECIFICATIONS
Internal digital signal processing: 24-bit
Analog-to-digital converters: 18-bit
Digital-to-analog converters: 18-bit
Max input level: +22dBu
Dynamic range: 100dB
Signal-to-noise ratio: 100dB
THD: 0.005%
Frequency response: 20Hz-20kHz
Common mode rejection: 100dB
Selectable input sensitivity: 10 dBU
20dBU
Connectors: Balanced inputs and unbalanced
loop-thru daisy-chain outputs on barrier strips
with 0.325" (8mm) center & 0.27" (7mm) lug space,
RJ-14 (‘RJ-11 6-pin’) N-Coder data port
Controls: 2 gain attenuators (w/removable knobs)
v. 2.1 4/7/97
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specification. Crest Audio specification literature is available in electronic form to qualified users.
Contact Crest Audio Inc. for more information. NexSys is a registered trademark of Crest Audio Inc. ©1996 Crest Audio Inc.
*A3300021*
CONTROL OPTIONS
The following NC-DSP-A parameters can be con-
trolled by N-Coder/PC software or via NexSys
software.
N-Coder/PC software:
Channel A & B attenuation, phase reverse, muting,
all DSP functions*.
NexSys computer control:
Channel A & B attenuation, phase reverse, solo,
muting, input and output VU metering; all DSP
functions*.
*DSP Programs: Stereo BP, HP and LP
crossovers, mono BP/BP, BP/HP, LP/BP, and
LP/HP crossovers, dual mono 5-band EQ
*DSPAlgorithms: Mixer, shelf, 4 and 5-band
parametric EQ, long delay, bandpass crossover, 4-
band parametric post EQ, short delay, limiter, gain